| Honorific-Prefix: | The Honourable |
| Willibald Joseph MacDonald | |
| Order: | 19th |
| Office: | Lieutenant Governor of Prince Edward Island |
| Term Start: | August 1, 1963 |
| Term End: | October 6, 1969 |
| Predecessor: | Frederick Walter Hyndman |
| Successor: | John George MacKay |
| Governor General: | Georges Vanier Roland Michener |
| Premier: | Walter R. Shaw Alex Campbell |
| Birth Date: | 27 January 1897 |
| Birth Place: | Souris, Prince Edward Island |
| Death Place: | Charlottetown, Prince Edward Island |
| Nationality: | Canadian |
| Children: | Inez, R.N. (Mrs. Justin Kelly), Joan, R.T., (Mrs. Dr. A. Raymond Grant), Dr. Douglas A.C. MacDonald, Stephanie, B.Sc. (Mrs. P.R. MacDonald), Dr. Louis V.A. MacDonald, William MacDonald (deceased) and G. Vernon MacDonald |
| Residence: | Charlottetown, Prince Edward Island |
| Alma Mater: | Prince of Wales College Saint Dunstan's University |
| Occupation: | Educator |
| Profession: | Politician |
Willibald Joseph MacDonald (January 27, 1897 - March 17, 1977[1]) was an educator and political figure on Prince Edward Island. He served as the 19th Lieutenant Governor of Prince Edward Island from August 1963 to October 1969.
He was born in Souris West, the son of Archibald J. MacDonald. MacDonald was educated in Souris, at Prince of Wales College and at Saint Dunstan's University, later becoming a professor at Prince of Wales College. He served overseas during World War I and also served in World War II. MacDonald married Agnes Smith Flynn in 1925.